Everything you need to know about dormers: types, cost, pros, and cons

Image source: Hometown Structures

Chris Gennone

By Chris Gennone

March 11, 2021


If you're looking to add a little more sunlight or attic space to your home, you should consider installing dormers. No matter if your attic or loft is an active living space or purely for storage, dormers offer several benefits. Dormers not only brighten a room, but they can provide more space, help ventilate your home, and even increase curb appeal. Let's dig into the details about the different types of dormers and get a better understanding of how they could benefit your home.

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What is a dormer?

Dormer roof structure on a residential home

Image source: Racine Roofing & Remodeling

Located on the slope of your roof, dormers are roofed structures that typically feature windows and increase the height of your ceiling. Dormer windows are also designed to give your attic or loft additional space, usually adding an additional 30 square feet. While there are many types of dormers to choose from, some are best suited for specific roof types.

Get in touch with a local roofing contractor today.

Types of dormers


Gabled dormer on a residential home

Image source: Flickr

Gable dormers or "doghouse dormers" are the most common type of dormers and can typically be installed on any type of roof. These dormers are triangular in shape with two sloped planes, which helps them shed rainwater easily, preventing any kind of leakage. Gable roofs are usually best for homeowners in colder, wetter climates because of their weather-resistance.

Average cost: $130 per square foot


Shed dormer on a residential home

Image source: Plandsg

Shed dormers are similar to flat roof dormers but feature a single slightly-sloped plane which gives an area a little more space. In addition to being able to accommodate smaller and larger-sized windows, the small slope on shed dormers also allows for water and snow to drain more easily.

Average cost: $100 per square foot


Flat dormer on a residential home

Image source: JHmraD

Though they look similar to shed dormers, flat roof dormers have no pitch or slope, which can become an issue with rain and snow build-up. The main benefit to installing flat dormers is that they will maximize the amount of space at a cheaper cost. To avoid water leaks, we recommend using a roof membrane such as EPDM, which is water-resistant. With any type of flat roof, you'll also need to provide routine maintenance to avoid any expensive repairs.

Average cost: $100 per square foot


Hipped dormer on a residential home

Image source: The Architect’s Guide

Hipped dormers are typically installed on hipped roofs, which slopes from all sides of the building. These dormers feature three sloped planes which shed water easily and help prevent any leakage from entering the home. Though hipped dormers are a little more expensive than others, they also offer a more striking appearance.

Average cost: $125 per square foot


Eyebrow dormer on a residential home

Image source: This is Carpentry

These curved dormers are primarily designed for aesthetic reasons and help increase your home's curb appeal. Eyebrow dormers don't provide any real additional space to a room, but they do bring in a decent amount of light. Because these dormers are curved and have different shingles than the rest of the roof, water leakage is possible. Eyebrow dormers are custom-made and can be expensive, costing more than a traditional skylight.

Average cost: $130 per square foot


Pedimented dormer on a residential home

Image source: Best in American Living

Similar to gabled dormers, pediment dormers have a triangular shape with two sloped planes. However, their major difference is that pedimented dormers extend out from the roof and typically appear in a row. Some pedimented dormers can be used in doorways, supported by pillars, and provide shelter from the rain.

Average cost: $225 per square foot


Arched dormer on a residential home

Image source: WCMA Net

While arched or barrel dormers feature a striking appearance, they typically don't provide as much additional space. This type of dormer is smaller in size but does let in a good amount of natural light with its larger, vertical windows.

Average cost: $125 per square foot


Wall dormer on a residential home

Image source: Home Stratosphere

Instead of extending away from the building, wall dormers extend the wall, creating more additional space for a room. They feature two sloped planes which are integrated with the main roof, separating the eave lines, preventing any water leakage. While they may not be the most aesthetically pleasing dormers, they are cheaper and easier to install.

Average cost: $100 per square foot

Pros and cons of dormers

Dormers on a suburban home

Image source: Hitchcock Roofing & Construction

Pros of dormers

Curb appeal - A study made by the Nationwide Building Society found that extending areas of your home, like skylights and dormers, can increase your home's value up to 20%.

Adds more light - Dormers help lighten up the darkest parts of any attic or loft space. With increased light and visibility, you'll be able to repurpose certain areas of the room as a reading area or sleeping room.

Adds more space - Perhaps the main benefit to installing dormers is the space it can add. Because dormers extend a wall or extend away from the building, they can add up to 250 square feet of space to a room.

Ventilation - With dormer windows, you'll also be able to help bring in cool air or let out hot air accumulating in higher levels of the home.

Cons of dormers

Difficult installation - Like with any construction, installing any dormer style will require an experienced professional. Not all roofers are experienced with installing dormers.

Expensive - With materials and labor, depending on the style and type of roof, could cost up to $12,000 or more. It's also important to remember to check with your local building department for any necessary permits to build dormers.

High maintenance - Depending on if you have a sloped roof or something flatter like a shed roof, these dormers may be more prone to water leakage. While dormers are usually installed with flashings, they can still be susceptible to moisture.

Are dormers worth buying?

Three dormers on a residential home

Image source: Budget Construction Company

Installing dormers or any type of renovation can be expensive. No matter if you have a sloping roof or a curved roof, dormers can be an excellent and quick way to increase the amount of space and square footage of your home. Dormers are best if you’re looking to add a little more space and natural light to a dark room, or if you’re looking to increase your home’s value before selling. But before you invest in dormers, make sure you have the proper building permits and hire an experienced craftsman with installing them.

Get in touch with a reputable roofing contractor today.

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